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Question number: 787

Question

A metal carbonate X on treatment with a mineral acid liberates a gas, which when passed through aqueous solution of a substance Y gives back X. The substances Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolourise coloured fabrics. The compounds X, Y and Z respectively are

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Question number: 788

Question

Consider a simple circuit containing a battery and three identical incandescent bulbs A, B and C. Bulb A is wired in parallel with bulb B and this combination is wired in series with bulb C. What would happen to the brightness of the other two bulbs if bulb A were to burn out?